Korean Journal Plant Pathology (한국식물병리학회지)
- Volume 10 Issue 3
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- Pages.192-196
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- 1994
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- 0256-8608(pISSN)
Fungicide-Resistance and Mating Type of Phytophthora infestans Causing Potato Late Blight
감자역병균(Phytophthora infestans De Bary)의 약제저항성 및 교배형
Abstract
Two hundred and fourty-seven isolates of Phytophthora infestans obtained from infested potato leaves from the spring of 1991 to the fall of 1993 from potato fields in various regions of Korea were tested for their fungicides resistances. A total of 20.9% isolates were not suppressed at 50 ppm of metalaxyl in 1991, but isolates from 1993 were suppressed at 50 ppm of metalaxyl. Ten resistant isolates and 10 susceptible isolates to metalaxyl were selected and tested against oxadixyl, fosetyl-Al, and phosphorous acid. Effectiveness of these chemicals were no better than that of metalaxyl. Dimethomorph suppressed all isolates at 1